3-2
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power check flow
No 3.4VA.
No 3.4VA
Is 3.4VA section working?
Is 3.4V present at emitter
of Q121?
Replace Q121.
Replace IC101.
Is there a DC voltage at
Cathode of D105 or D107?
Check FR101
No 5V
Is 3.4VA section working?
Replace Q126.
Is 5.6V present at collector
of Q126?
NO
NO
YES
YES
YES
Check D105/D106/D107/
D108 and replace.
YES
YES
A.
B.
NO
NO
NO
Summary of Contents for DV140
Page 25: ...3 15 FIG 7 2 DVD FIG 7 3 CD F F FE FE RFL RFL...
Page 26: ...3 16 FIG 7 4 CD 8 FOCUS ON WAVEFORM FIG 8 1 DVD FE FOSO F F F FE RFL...
Page 30: ...3 20 2 COMPOSITE VIDEO SIGNAL FIG 13 2 13 AUDIO OUTPUT FROM AUDIO DAC FIG 13 1...
Page 37: ...3 28 3 29 2 AV JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Page 38: ...3 30 3 31 A B C D E F G H I J K L M N O P Q R S T 3 SYSTEM CIRCUIT DIAGRAM...
Page 40: ...3 34 3 35 5 TIMER CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Page 42: ...3 38 3 39 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD LOCATION GUIDE...
Page 44: ...3 42 3 43 4 SMPS P C BOARD 360mm ONLY LOCATION GUIDE 430mm ONLY...
Page 45: ......
